[Text] word starting [q] must have a valid counterpart word starting [o]

[davidjackson]

As they say, the exception proves (tests) the rule.

By they should all comply with the language rules, (here I extrapolate from known natural languages )  unless they are loan words - in which case, how is the encoding system working if it is bending a bigraph?
English works well in this case, it has no problem in accommodating q+vowel but only in the case of loan words. A peculiarity of which I know of no studies.
But how would an encoding system capable of producing voynichese cope with these loan words